Yes, if the screen is all still there with just a tear in it, I feel it makes an excellent backer for the JB Weld. Think of how fiberglass is made, mats of glass fiber coated with resin.
I've mentioned it before but I'll do so again - I finally had one of my patched filters fail, but it wasn't the patch. It tore out on the backside, opposite the patch. It seems when we patch and cover that normally torn area, it simply shifts the big stress point elsewhere. Eventually, I can see that whole end of the filter around the oil intake hole getting covered, maybe even from magnet to magnet, lol.
I'm toying with the idea of making some angle shaped covers for that end that could be mounted under the two filter mounting bolts, one on each side. They could keep oil from being drawn in too strongly at that end, but they wouldn't stop the suction against the inside of the screening. That might still be an issue and still cause tearing. But, the covers would be easy to pop off so you could check the condition of the filter.
I've mentioned it before but I'll do so again - I finally had one of my patched filters fail, but it wasn't the patch. It tore out on the backside, opposite the patch. It seems when we patch and cover that normally torn area, it simply shifts the big stress point elsewhere. Eventually, I can see that whole end of the filter around the oil intake hole getting covered, maybe even from magnet to magnet, lol.
I'm toying with the idea of making some angle shaped covers for that end that could be mounted under the two filter mounting bolts, one on each side. They could keep oil from being drawn in too strongly at that end, but they wouldn't stop the suction against the inside of the screening. That might still be an issue and still cause tearing. But, the covers would be easy to pop off so you could check the condition of the filter.